[pypy-dev] JVM backend - status and future work possibilities?

[Paul deGrandis]

A few years back I had started the process of using JPype with PyPy.  I most
recently started digging into Clojure and JDK 7 (
https://github.com/ohpauleez/soymacchiato), but I now have some free
cycles.  I'd certainly be up for digging in.

Paul


2011/5/13 Michał Bendowski <michal at bendowski.pl>

> Thank you for your support Niko, Antonio and Charles. It seems that
> the plan for now is to dig into pypy and try to get familiar with the
> source (and I imagine it's not an easy task). As Antonio mentioned,
> the first step is probably to work on integration at the RPython level
> - and we should probably collaborate on that. Later we will have to
> split probably, as a master's thesis is usually supposed to be an
> individual contribution. That's not a problem for me right now, since
> I will be doing an internship during the summer and I won't be able to
> spend as much time on the project as I would like to. And everything
> can change during that time :)
>
> Just out of curiosity - where are you guys (Bo, Dario) studying? I'm
> from the University of Warsaw.
>
> Cheers,
>
> Michał
>
>
>
> On Fri, May 13, 2011 at 09:29, Niko Matsakis <niko at alum.mit.edu> wrote:
> > Hello everyone,
> >
> > I just wanted to say that I am certainly available to answer questions
> about
> > the code that exists.  I don't know how much work has been done on it
> since
> > I last touched it, though.  I would be interested in helping out somewhat
> as
> > well, but at the moment my time is very limited... I'm in the process of
> > finishing up my PhD as well as various other projects. Anyway, I
> definitely
> > think it'd be great if the JVM backend saw some attention!
> >
> >
> > Niko
> >
> > Antonio Cuni wrote:
> >
> > On 11/05/11 23:02, Michał Bendowski wrote:
> >
> > Welcome everyone :)
> >
> > I was wondering what is the current status of the JVM backend.
> >
> > [cut]
> >
> > Hello Michał, Dario, Bo,
> > I'm glad to see that there is interest around the JVM backend :-)
> >
> > Here is a summary of the current status and possible future direction.
> >
> > What works: translation of the basic interpreter to JVM
> >
> > What does not work/it's not there:
> >
> >   1) integration with the JVM classes at the RPython level
> >   2) integration with the JVM classes at application level
> >   3) JIT backend
> >   4) a lot of modules which currently only work with the C backend
> >
> > Point (1) is a blocker for the rest, so it must be done before everything
> > else.
> >
> > The idea, is to be able to instantiate java classes and call java methods
> > from
> > RPython code: the JVM backend will then turn these into the corresponding
> > bytecode (invokespecial/invokevirtual).  This is "easy", but you need a
> deep
> > understanding of the internals of the RPython toolchain to implement this
> > (in
> > particular, the annotation and the rtyping phases).
> >
> > The other requirement is that we want to be able to do JVM call also
> during
> > testing.  As know, RPython is a subset of Python, and you can either
> > translate
> > it to C/JVM/CLI or execute it directly on top of CPython.  The latter is
> > what
> > we do all the time when doing testing.  Testing on top of CPython is
> > extremely
> > convenient for a large number of reasons which I'm not going to explain
> > because it's late :-)
> >
> > We do not want to loose the possibility of testing on top of CPython,
> even
> > when our RPython code contains calls to JVM classes.  So, we need a way
> to
> > interface with the JVM from CPython, and this is why I asked Dario to
> > investigate on JPype and JTool.
> >
> > Once step (1) is complete, the other tasks can be done in parallel.
> >
> > ciao,
> > Anto
> > _______________________________________________
> > pypy-dev mailing list
> > pypy-dev at python.org
> > http://mail.python.org/mailman/listinfo/pypy-dev
> >
> >
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